Life cycle of Fragment

In order to work with Fragment, Lifecycle of Fragment is a must known issue.

It's a experience to know Lifecycle of Fragment. It display the called lifecycle relate method on screen. Via this experience, you (and me) can know more about it.

Create /res/layout/fragmentlayout.xml, the layout of the fragment.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >
   <TextView
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="It's Fragment" />
   <ImageView
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:src="@drawable/ic_launcher"/>
</LinearLayout>

MyFragment.java, extends Fragment.

package com.exercise.AndroidExFragment;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class MyFragment extends Fragment {

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  View myFragmentView = inflater.inflate(R.layout.fragmentlayout, container, false);
  updateMyStatus("onCreateView()");
  return myFragmentView;
 }
 
 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onActivityCreated(savedInstanceState);
  updateMyStatus("onActivityCreated()");
 }

 @Override
 public void onAttach(Activity activity) {
  // TODO Auto-generated method stub
  super.onAttach(activity);
  updateMyStatus("onAttach()");
 }

 @Override
 public void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  updateMyStatus("onCreate()");
 }

 @Override
 public void onDestroy() {
  // TODO Auto-generated method stub
  super.onDestroy();
  updateMyStatus("onDestroy()");
 }

 @Override
 public void onDestroyView() {
  // TODO Auto-generated method stub
  super.onDestroyView();
  updateMyStatus("onDestroyView()");
 }

 @Override
 public void onDetach() {
  // TODO Auto-generated method stub
  super.onDetach();
  updateMyStatus("onDetach()");
 }

 @Override
 public void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  updateMyStatus("onPause()");
 }

 @Override
 public void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  updateMyStatus("onResume()");
 }

 @Override
 public void onStart() {
  // TODO Auto-generated method stub
  super.onStart();
  updateMyStatus("onStart()");
 }

 @Override
 public void onStop() {
  // TODO Auto-generated method stub
  super.onStop();
  updateMyStatus("onStop()");
 }

 private void updateMyStatus(String myst){
  ((AndroidExFragmentActivity)getActivity()).updateStatus(" >> MyFragment: " + myst);
 }

}

The main activity, AndroidExFragmentActivity.java.

package com.exercise.AndroidExFragment;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidExFragmentActivity extends Activity {
 
 TextView status;
 String myStatus = "";
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        status = (TextView)findViewById(R.id.status);
        updateMyStatus("onCreate()");
    }

    @Override
 protected void onDestroy() {
  // TODO Auto-generated method stub
  super.onDestroy();
  updateMyStatus("onDestroy()");
 }

 @Override
 protected void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  updateMyStatus("onPause()");
 }

 @Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  updateMyStatus("onResume()");
 }

 @Override
 protected void onStart() {
  // TODO Auto-generated method stub
  super.onStart();
  updateMyStatus("onStart()");
 }

 @Override
 protected void onStop() {
  // TODO Auto-generated method stub
  super.onStop();
  updateMyStatus("onStop()");
 }

 private void updateMyStatus(String myst){
  updateStatus("Activity: " + myst);
 }
    
    public void updateStatus(String st){
     
     if(status == null){
      myStatus += "delay - " + st + "\n";
     }else{
      myStatus += st + "\n";
      status.setText(myStatus);
     }
    }
}

main.xml, the main layout to include our fragment.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >
    
    <ScrollView 
        android:layout_width="0px"
        android:layout_weight="3"
        android:layout_height="match_parent">
        <TextView
            android:id="@+id/status"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#555555"/>
    </ScrollView>

    <fragment
        class="com.exercise.AndroidExFragment.MyFragment"
        android:id="@+id/myfragment"
        android:layout_width="0px"
        android:layout_weight="2"
        android:layout_height="match_parent" />

</LinearLayout>

Download the files.

Related:
- Life cycle of MasterDetailFlow HelloWorld